Freescale Semiconductor, Inc.
1 – EXTEST
0 – OTHERWISE
TO NEXT
CELL
SHIFT DR
G1
1
OUTPUT
FROM
SYSTEM
LOGIC
TO OUTPUT
DRIVER
MUX
1
G1
G1
1
1
1
1
1D
C1
MUX
MUX
1D
C1
FROM OUTPUT FROM PIN
ENABLE
FROM LAST
CELL
CLOCK DR
UPDATE DR
Figure 9-7. Bidirectional Data Cell (IO.Cell)
TO NEXT CELL
IO.CTL0
OR
IO.CTL1
OUTPUT
ENABLE
*
EN
I/O
PIN
OUTPUT
DATA
IO.CELL
INPUT
DATA
FROM LAST CELL
TO NEXT
BIDIRECTIONAL
PIN
NOTE: More than one lO.Cell could be serially connected and controlled by a single IO.Ctlx cell.
Figure 9-8. General Arrangement for Bidirectional Pins
9.4 INSTRUCTION REGISTER
The MC68340 IEEE 1149.1 implementation includes the three mandatory public
instructions (EXTEST, SAMPLE/PRELOAD, and BYPASS), but does not support any of
the optional public instructions defined by IEEE 1149.1. One additional public instruction
(HI-Z) provides the capability for disabling all device output drivers. The MC68340
MOTOROLA
MC68340 USER’S MANUAL
9- 9
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